Stage 2 - GRP Trims

The following pages include instructions for fixing the most common types of GRP edge trims. For a comprehensive list of trim applications see the Technical section of this manual.

Edge trims are manufactured in GRP. One side has a high adhesion finish (matt finish), the other side has a glossy finish, always bond to the matt finish.

All trims must be fixed with nails or staples to the decking board.

With the exception of the F300 Flat flashing and the D260 Angle fillet, the trims must be bonded in place using the Polyurethane Adhesive. Silicone sealant or general-purpose mastics are not suitable adhesives for the fixing of trims.

Polyurethane Adhesive (PU)

PU adhesive is applied with a skeleton gun to the batten around the perimeter of the roof. A 30mm bead at 300mm centres is sufficient to hold the trims in place. The trims should be ‘rubbed’ into place to ensure good bonding.

Joining Trims

Trims are either nailed to the decking boards using a 13mm galvanised clout nail or stapled in place with a gas powered or compressed air stapler. Hold the trim in place ensuring the face is vertical. Drive fixings in at each end, then the middle and then at 200mm centres thereafter.

The A type trim is a drip trim, fitted to the lowest edge of the roof usually where the rainwater flows into the gutter. Two support battens should be fixed to the perimeter of the roof to provide space for the gutter to fit behind the trim, with the outer batten attached 10mm lower than the inner batten to allow the trim to sit flush with the roof. Apply PU adhesive to the batten in 30mm beads at 300mm centres, rub the trim into place and nail to the decking. Do not nail through the front of the trim. If the pitch of the roof is only minimal, rainwater is likely to hold behind the trim. A planning machine can be used to take 2mm off the deck to allow the trim to lay flush with the board.TRIM DETAILS:A170: This is designed for applications where it is not possible to use the larger A200.A200: This is the standard size drip trim. A250: This drip trim is ideally suited for use on warm roofs.

A170/200/250 Application diagrams:

B230/B260/B300 - Raised Edge Trim

A single batten is fixed level with the top edge of the deck. Apply 30mm beads of PU adhesive to the batten every 300mm, rub the trim into place and nail through the top of the trim into the decking. Do not nail through the front of the trim. If a ladder is likely to be leant against a B type trim for regular access to the roof, the trim will need to be reinforced to avoid deformation. The trim can either be doubled up by slotting a section of extra trim within the section where the ladder will be used or it can be reinforced with an extra layer of GRP laminate and then tissue to maintain a smooth finish. Alternately, a wooden batten can be shaped and fitted into the ridge of the trim to ensure that it remains rigid.TRIM DETAILS:B230: The smallest size of raised edge trim fitted to the edges of the roof to contain and direct the flow of water. B260: The standard size raised edge trim.B300: Larger raised edge trim for use on warm roofs.

B230/260/300 Application diagrams

C100/C100MT/C100L/C100LMT/C150/C150MT/C150L - Simulated Lead Flashing

The C trim is usually fitted into a bed joint of the brickwork or a 35/50mm (depending on the trim type) deep chase cut out with an angle grinder fitted with a mortar chase disc. Apply polyurethane adhesive to the back of the C trim every 300mm. Fit the trim into the slot and press firmly back to the wall to overlap the D trim. Apply a clear silicone sealant along the length of the trim into the slot to seal the trim in. A smooth finish can be obtained by wiping the sealant with a moistened finger.TRIM DETAILS:C100: Standard simulated lead flashing with 100mm vertical face and 35mm wall penetration. Do not topcoat. C100MT: As C100 with self securing moisture trap. C100L (Long leg): As C100 with 50mm wall penetration. C100LMT (Long leg with Moisture Trap): As C100 with 50mm wall penetration and self securing moisture trap. C150: Simulated lead flashing with 150mm vertical face and 35mm wall penetration. Do not topcoat. C150MT (Moisture Trap): As C150 with an integral, self-securing moisture trap. C150L (Long leg): As C150 with 50mm wall penetration.

C100/C100MT/C100L/C100LMT/C150/C150MT/ Application diagrams

D260/D300 - Fillet Trim

The D trim is a fillet trim for use against abutting walls. It will also provide expansion andperimeter ventilation and is compatible with C2 and C3 universal corners. Place the D trimagainst the vertical face and push down diagonally into the corner until the trim fits snugly.Where the D trim needs to be joined it should be bonded with a strip polyurethane adhesiveand bandaged together.TRIM DETAILS:D260: Angle fillet trim with 135 and 70mm flanges. D300: Angle fillet trimwith 175mm and 70mm flanges.

D260/D300 Application Diagrams

F300/600/900 - Flat Sheeting

The F trim is a flat flashing, mainly used at the intersection of a pitched roof and flat roof often found on dormers. The F trim should not be laminated over completely as it will crack. It is nailed or stapled to the deck and bent up the roof slope. In this situation, the F trim also acts as an expansion facility and must only be fixed to the deck along the bottom edge. There are many other applications for F trim including vertical details where laminating would be time consuming, under the feet of air conditioning units to enable re-roofing without disconnecting and use on some parapet wall details etc. The trim should be nailed to the deck around its edges and bandaged over any joins or nail penetrations. Any unlaminated trim can be topcoated with the rest of the roof.TRIM DETAILS:F300/600/900: Flat sheeting supplied in 300, 600 and 900mm widths in 20m rolls.

F300/600/900 Application diagrams

G180

G180 is used to allow for expansion on large roofs (over 50m2) it also acts as an integral gutter to aid drainage. The decking should be cut to allow for an adequate gap in which to insert the trim and the flanges of the trim should be parallel with the decking. The trim should then be nailed to the decking. If the trim edges are bandaged waterflow into the gutter will be reduced. The boards should be rebated to allow the trim to sit flush with the deck. The laminate should be applied over the trim.TRIM DETAILS:G180: Flush installation expansion joint and gutter.

G180 Application diagrams

E280 - Expansion Joint

E280 is used both to create expansion joints on large roofs (over 50m2) and create rolls on any ridge details. It is compatible with C5 closures. An adequate gap in the deck should be cut if necessary, the trim should then be nailed to each end of the decking at 300mm centres. The join over the nails should then be bandaged and the laminate can be applied over the trim. To bond these trims together, or to cap with C5 closures, apply a thin strip of PU adhesive to the inside edge of the overlapping trim and rub into place.TRIM DETAILS:E280: Expansion joint and ridge roll for pitched roofs.

E280 - Application Diagrams

C6 Closures

The C6 closure is used to close a run of E280 rolled joint trim. The closure should be overlapped by 50mm and sealed by a line of PU adhesive. Nail to deck, bandage around edges and apply topcoat layer over the top.

A195 Internal and External

The AT195 Internal and External trim is used wherever the laminate needs to cover an area which continues perpendicular to another laminated surface. The AT195 Ext is supplied with a high-adhesion finish on its outer fascia and should be used for capping applications. The AT195 Int trim is supplied with a high adhesion finish on its outer fascia and should be used for internal corners. The trim should be nailed at both edges if possible. Always bandage over the join between where the nails penetrate the trim and the decking before applying the laminate. These trims are supplied in 3 metre lengths as standard.TRIM DETAILS:AT195 Ext: External angle trim. AT195 Int: Internal angle trim.